Vacuum concentration device for preparing glucosamine

Abstract

The invention discloses a vacuum concentration device for glucosamine preparation, and relates to the technical field of glucosamine preparation, the vacuum concentration device comprises a supporting bottom plate and a vacuum concentration tank body, the top of the vacuum concentration tank body is provided with a top cover, and the right side wall of the vacuum concentration tank body is provided with a vacuum pump which is communicated with the vacuum concentration tank body; the vacuum concentration tank is further provided with a separation assembly arranged in a communicated mode, a spraying cleaning component is arranged at the bottom of an inner cavity of the vacuum concentration tank, the inner cavity of the vacuum concentration tank is further provided with a mixing and scraping mechanism, the mixing and scraping mechanism comprises a servo motor and a cylinder, and the outer wall of the cylinder is connected with multiple sets of stirring blades, connecting rods and arc-shaped scraping plates. The mixing and scraping mechanism can drive the multiple sets of stirring blades to rotate, the heating effect on glucosamine liquid is good, the spraying and cleaning component and the mixing and scraping mechanism can rapidly scrape glucosamine raw material residues remaining on the inner wall of the vacuum concentration tank body, and the situation that the residual raw materials affect next-time glucosamine concentration is avoided; the concentration effect of the vacuum concentration device for preparing the glucosamine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of glucosamine preparation, in particular to a vacuum concentrating device for glucosamine preparation. Background Art

[0002] Glucosamine, also known as glucosamine, is a natural amino monosaccharide with a chemical formula of C6H13NO5. It is an important component of proteoglycans synthesized in human articular cartilage, and has the functions of protecting articular cartilage, anti-inflammatory, and promoting chondrocyte metabolism and repair. The vacuum concentrator for glucosamine preparation is a device specially designed for concentrating glucosamine solution. It uses a vacuum environment to reduce the boiling point of the solution, thereby achieving efficient concentration at a lower temperature.

[0003] When the existing vacuum concentrator for preparing glucosamine is in use, the glucosamine raw material liquid is poured into a vacuum concentrator body that has been evacuated and then heated to achieve the purpose of vacuum concentration. The glucosamine raw material directly poured into the vacuum concentrator body is not heated sufficiently, which affects the subsequent concentration effect. In addition, most of the existing sealed vacuum concentrator bodies are not convenient to clean. The glucosamine raw material residues remaining on the inner wall of the vacuum concentrator body will adhere to the inner wall of the vacuum concentrator body. As time accumulates, the residues will accumulate more and more, affecting the subsequent concentration effect of glucosamine. For this reason, we propose a vacuum concentrator for preparing glucosamine. Summary of the invention

[0004] The object of the present invention is to provide a vacuum concentrator for preparing glucosamine, so as to solve the problems in the above-mentioned background technology that the glucosamine raw material is not heated sufficiently and the sealed vacuum concentrator tank is inconvenient to clean.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A vacuum concentration device for preparing glucosamine comprises a supporting bottom plate, four groups of brackets are arranged on the supporting bottom plate, a vacuum concentration tank body is installed on the four groups of brackets, a temperature display screen, a barometer and a control panel are arranged on the front face of the vacuum concentration tank body, a top cover is arranged on the top of the vacuum concentration tank body, and a feeding hopper connected to the inner cavity of the vacuum concentration tank body is arranged on the top cover, a discharge pipe arranged in communication is connected to the bottom of the vacuum concentration tank body, and a solenoid valve is arranged in the discharge pipe and the feeding hopper, a vacuum pump is installed on the right side wall of the vacuum concentration tank body, and the vacuum pump is connected to the inner cavity of the vacuum concentration tank body through a pipeline, and a separation component arranged in communication is also arranged on the vacuum concentration tank body;

[0007] A spray cleaning component is provided at the bottom of the inner cavity of the vacuum concentration tank, and the spray cleaning component includes two sets of high-pressure nozzles;

[0008] The inner cavity of the vacuum concentration tank is also provided with a mixing and scraping mechanism, which includes a servo motor, which is installed on the top of the top cover, and the output end of the servo motor is connected to a driving shaft, and a cylinder is provided at the bottom of the driving shaft, and the outer wall of the cylinder is connected to multiple groups of stirring blades, and the outer wall of each group of stirring blades is installed with a connecting rod, and the other end of each group of connecting rods is installed with an arc-shaped scraper plate, and the arc-shaped outer wall of each group of arc-shaped scraper plates is in contact with the inner wall of the vacuum concentration tank.

[0009] Preferably, the spray cleaning component also includes a water pump, which is connected to the left outer wall of the vacuum concentration tank body, the water inlet of the water pump is connected to a clean water pipe, the water outlet of the water pump is installed with a water supply pipe, and the water supply pipe is provided with two groups of interconnected shunt pipes, and the two groups of shunt pipes are respectively connected to two groups of high-pressure nozzles.

[0010] Preferably, the bottom of the driving shaft passes through the top cover, and the bottom of the driving shaft is connected to a mounting plate, and two sets of connecting frames are provided on the lower surface of the mounting plate, and the bottoms of the two sets of connecting frames are connected to the side walls of the cylinder, and the mixing and scraping mechanism also includes a stepper motor, which is located at the top of the cylinder.

[0011] Preferably, the output end of the stepper motor is connected to a screw rod, the bottom of which is rotatably connected to the bottom wall of the inner cavity of the cylinder through a bearing, and multiple sets of threaded sleeves are threadedly connected to the screw rod, and through slide grooves are provided on both side walls of the cylinder, and multiple sets of connecting slide blocks are vertically slidably connected in the through slide grooves on both sides, and the two ends of the connecting slide block are respectively connected to the threaded sleeve and the stirring blade.

[0012] Preferably, the separation component includes a liquid receiving box, which is connected to the supporting bottom plate through a supporting frame, and a drain pipe is installed on the bottom side wall of the liquid receiving box, and a cooler is installed on the top of the liquid receiving box.

[0013] Preferably, a first condenser is installed on the vacuum concentration tank body, a separator is installed on the other end of the first condenser, a second condenser is connected to the separator, and the bottom end of the second condenser is connected to the cooler, a reflux pipe is also installed on the separator, and the other end of the reflux pipe is connected to the inner cavity of the vacuum concentration tank body.

[0014] Preferably, a sealing gasket is provided at the connection between the top cover and the vacuum concentration tank body, and a protective shell is installed on the outside of the stepper motor.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention can drive the driving shaft and the bottom cylinder to rotate by the operation of the servo motor on the mixing and scraping mechanism. After the multiple groups of stirring blades on the outer wall of the cylinder rotate, the glucosamine liquid in the vacuum concentration tank can be mixed and stirred, so that the glucosamine liquid is fully in contact with the heating structure in the vacuum concentration tank, the heating effect of the glucosamine liquid raw material is good, and the vacuum concentration effect is improved; through the operation of the water pump on the spray cleaning component, clean water can be transported to the water supply pipe, and the two groups of manifolds can then transport the clean water to the two groups of high-pressure nozzles, and the two groups of high-pressure nozzles spray the clean water into the vacuum concentration tank, and the mixed The stepper motor on the scraping mechanism can drive the screw to rotate. After the multiple sets of threaded sleeves connected to the screw thread pass through the sliding groove and the connecting slider for sliding limit, the multiple sets of stirring blades and arc-shaped scraper plates can move back and forth up and down. In conjunction with the rotation of the cylinder, the water spraying of the high-pressure nozzle, the rotating and up and down reciprocating arc-shaped scraper plates can quickly scrape off the glucosamine raw material residues remaining on the inner wall of the vacuum concentration tank, thereby realizing rapid cleaning of the vacuum concentration device, avoiding the residual raw materials from affecting the next glucosamine concentration effect, and improving the concentration effect of the vacuum concentration device for glucosamine preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the front structure of the vacuum concentration tank of the present invention;

[0019] Figure 3 It is a schematic cross-sectional view of the front structure of the vacuum concentration tank of the present invention;

[0020] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0021] Figure 5 It is a cross-sectional schematic diagram of the front connection structure of the cylinder, the stirring blade and the arc-shaped scraper plate of the present invention;

[0022] Figure 6 For the present invention Figure 5 Enlarged structural diagram at B in the middle.

[0023] In the figure: 1. Support bottom plate; 2. Bracket; 3. Vacuum concentration tank; 4. Top cover; 5. First condenser; 6. Separator; 7. Reflux pipe; 8. Second condenser; 9. Cooler; 10. Liquid receiving tank; 11. Drain pipe; 12. Temperature display screen; 13. Pressure gauge; 14. Control panel; 15. Vacuum pump; 16. Drain pipe; 17. Feeding hopper; 18. Spray cleaning parts; 180. Water pump; 181. Clean water pipe ; 182, water supply pipe; 183, diversion pipe; 184, high-pressure nozzle; 19, mixing and scraping mechanism; 190, servo motor; 191, cylinder; 192, drive shaft; 193, mounting plate; 194, connecting frame; 195, stepping motor; 196, stirring blade; 197, connecting rod; 198, arc-shaped scraper plate; 199, screw rod; 1910, threaded sleeve; 1911, through slide groove; 1912, connecting slider. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1:

[0026] See also Figure 1-6 The present invention provides a technical solution: a vacuum concentration device for preparing glucosamine, comprising a supporting bottom plate 1, four groups of brackets 2 are arranged on the supporting bottom plate 1, a vacuum concentration tank body 3 is installed on the four groups of brackets 2, a temperature display screen 12, a barometer 13 and a control panel 14 are arranged on the front face of the vacuum concentration tank body 3, a top cover 4 is arranged on the top of the vacuum concentration tank body 3, and a feeding hopper 17 connected to the inner cavity of the vacuum concentration tank body 3 is arranged on the top cover 4, a discharge pipe 16 is connected to the bottom of the vacuum concentration tank body 3, and solenoid valves are arranged in the discharge pipe 16 and the feeding hopper 17, a vacuum pump 15 is installed on the right side wall of the vacuum concentration tank body 3, and the vacuum pump 15 is connected to the inner cavity of the vacuum concentration tank body 3 through a pipeline, and a separation component is also arranged on the vacuum concentration tank body 3;

[0027] The four groups of brackets 2 support the entire vacuum concentration tank 3. Before use, the electrical ends of each electrical device are electrically connected to the external power supply and the electrical ends of the control panel 14 through wires. When preparing glucosamine, its raw materials need to be vacuum concentrated. First, the solenoid valve on the feeding hopper 17 is opened, and the solenoid valve on the discharge pipe 16 is closed. The glucosamine raw material is poured from the feeding hopper 17 into the vacuum concentration tank 3. Then, the solenoid valve on the feeding hopper 17 is closed to make the vacuum concentration tank 3 in a sealed state. The vacuum pump 15 operates to evacuate the inside of the vacuum concentration tank 3 until the value on the barometer 13 reaches the set value. The heating structure in the vacuum concentration tank 3 then heats the glucosamine raw material liquid until the value on the temperature display screen 12 reaches the set value. Under the vacuum environment, the boiling point of the glucosamine raw material liquid decreases, and the solvent begins to evaporate. The evaporated solvent is condensed into liquid through the separation component and recovered, while the concentrated glucosamine remains in the vacuum concentration tank 3. After the solenoid valve on the discharge pipe 16 is opened later, the concentrated glucosamine can be discharged;

[0028] A spray cleaning component 18 is provided at the bottom of the inner cavity of the vacuum concentration tank body 3, and the spray cleaning component 18 includes two groups of high-pressure nozzles 184; when the interior needs to be cleaned after the glucosamine concentration is completed, the feeding hopper 17 no longer adds glucosamine raw materials, and the solenoid valve on the discharge pipe 16 can be opened, and the spray cleaning component 18 transports the external clean water to the two groups of high-pressure nozzles 184, and the two groups of high-pressure nozzles 184 spray the clean water into the interior of the vacuum concentration tank body 3, so as to flush the inner wall of the vacuum concentration tank body 3, and the flushing waste water can be discharged through the discharge pipe 16;

[0029] The inner cavity of the vacuum concentration tank body 3 is also provided with a mixing and scraping mechanism 19, which includes a servo motor 190, which is installed on the top of the top cover 4, and the output end of the servo motor 190 is connected to a drive shaft 192, and a cylinder 191 is provided at the bottom of the drive shaft 192, and the outer wall of the cylinder 191 is connected to multiple groups of stirring blades 196, and the outer wall of each group of stirring blades 196 is installed with a connecting rod 197, and the other end of each group of connecting rods 197 is installed with an arc scraper plate 198, and each group of arc scrapers The arc-shaped outer wall of the plate 198 is in contact with the inner wall of the vacuum concentration tank body 3; when the vacuum concentration tank body 3 heats the glucosamine raw material liquid inside, the servo motor 190 on the mixing and scraping mechanism 19 works, which can drive the cylinder 191 and the multiple groups of stirring blades 196 on the outer wall to rotate, and the glucosamine liquid in the vacuum concentration tank body 3 can be mixed and stirred, so that the glucosamine liquid is fully in contact with the heating structure in the vacuum concentration tank body 3, the heating effect of the glucosamine liquid raw material is good, and the vacuum concentration effect is improved;

[0030] When cleaning the residue remaining on the inner wall of the vacuum concentration tank body 3, the mixing and scraping mechanism 19 causes the multiple groups of stirring blades 196 and the arc-shaped scraper plate 198 to move back and forth up and down. In conjunction with the rotation of the cylinder 191, the water spraying of the high-pressure nozzle 184, the rotation and the arc-shaped scraper plate 198 that moves back and forth up and down can quickly scrape off the glucosamine raw material residue remaining on the inner wall of the vacuum concentration tank body 3, thereby realizing rapid cleaning of the vacuum concentration device, avoiding the residual raw materials from affecting the next glucosamine concentration effect, and improving the concentration effect of the vacuum concentration device for glucosamine preparation.

[0031] Among them, the spray cleaning component 18 also includes a water pump 180, which is connected to the left outer wall of the vacuum concentration tank body 3, and the water inlet of the water pump 180 is connected to a clean water pipe 181, and the water outlet of the water pump 180 is installed with a water supply pipe 182, and the water supply pipe 182 is provided with two groups of connected branch pipes 183, and the two groups of branch pipes 183 are respectively connected to two groups of high-pressure nozzles 184; the clean water pipe 181 is connected to an external clean water source, and the water pump 180 transports the clean water to the water supply pipe 182 after working, and the two groups of branch pipes 183 then transport the clean water to the two groups of high-pressure nozzles 184, and the two groups of high-pressure nozzles 184 then spray the clean water into the vacuum concentration tank body 3.

[0032] The bottom of the driving shaft 192 passes through the top cover 4, and the bottom of the driving shaft 192 is connected to a mounting plate 193, and two sets of connecting frames 194 are provided on the lower surface of the mounting plate 193, and the bottoms of the two sets of connecting frames 194 are connected to the side walls of the cylinder 191, and the mixing and scraping mechanism 19 also includes a stepper motor 195, and the stepper motor 195 is located at the top of the cylinder 191; the driving shaft 192 is fixedly connected to the mounting plate 193, and the mounting plate 193 is welded to the cylinder 191 through two sets of connecting frames 194. After the servo motor 190 is working, the rotation of the driving shaft 192 can drive the cylinder 191 to rotate.

[0033] The output end of the stepper motor 195 is connected to a screw rod 199, the bottom of the screw rod 199 is rotatably connected to the bottom wall of the inner cavity of the cylinder 191 through a bearing, and multiple sets of threaded sleeves 1910 are threadedly connected to the screw rod 199, and both side walls of the cylinder 191 are provided with through slide grooves 1911, and multiple sets of connecting slide blocks 1912 are vertically slidably connected in the through slide grooves 1911 on both sides, and both ends of the connecting slide block 1912 are respectively connected to the threaded sleeve 1910 and the stirring blade 196;

[0034] The two side walls of the threaded sleeve 1910 are respectively fixedly connected to the connecting sliders 1912 on both sides, the connecting slider 1912 is fixedly connected to the stirring blade 196, and the stirring blade 196 is fixedly connected to the arc scraper plate 198 through the connecting rod 197. The operation of the stepper motor 195 can drive the screw rod 199 to rotate forward or reverse. After the multiple groups of threaded sleeves 1910 threadedly connected to the screw rod 199 pass through the sliding limit of the through-slot 1911 and the connecting slider 1912, the connecting slider 1912 can move back and forth up and down in the through-slot 1911, that is, the multiple groups of stirring blades 196 and the arc scraper plate 198 can move back and forth up and down.

[0035] The separation component includes a liquid receiving box 10, which is connected to the supporting base plate 1 through a supporting frame, and a drain pipe 11 is installed on the bottom side wall of the liquid receiving box 10, and a cooler 9 is installed on the top of the liquid receiving box 10.

[0036] A first condenser 5 is also installed on the vacuum concentration tank body 3, and a separator 6 is installed on the other end of the first condenser 5. The separator 6 is connected to a second condenser 8, and the bottom end of the second condenser 8 is connected to a cooler 9. A reflux pipe 7 is also installed on the separator 6, and the other end of the reflux pipe 7 is connected to the inner cavity of the vacuum concentration tank body 3.

[0037] Embodiment 2:

[0038] Reference Figure 1 and Figure 4 This embodiment is different from the first embodiment in that a sealing gasket is provided at the connection between the top cover 4 and the vacuum concentration tank body 3, and a protective shell (not shown in the figure) is installed on the outer side of the stepping motor 195; the sealing gasket improves the sealing performance of the connection between the two to avoid affecting the vacuum pumping effect of the vacuum pump 15, and the protective shell can provide protection for the stepping motor 195 to prevent the glucosamine raw material liquid from rusting due to long-term contact with it, thereby extending its service life.

[0039] Working principle: Before using the present invention, the electrical ends of each electrical device are electrically connected to the external power supply and the electrical ends of the control panel 14 through wires. When preparing glucosamine, the raw materials need to be vacuum concentrated. First, open the solenoid valve on the feeding hopper 17, close the solenoid valve on the discharge pipe 16, pour the glucosamine raw materials from the feeding hopper 17 into the vacuum concentration tank body 3, then close the solenoid valve on the feeding hopper 17, so that the vacuum concentration tank body 3 is in a sealed state, and the vacuum pump 15 operates to evacuate the inside of the vacuum concentration tank body 3 until the value on the barometer 13 reaches the set value, and the heating structure in the vacuum concentration tank body 3 heats the glucosamine raw material liquid until the value on the temperature display screen 12 reaches the set value. As of the numerical value, when the vacuum concentration tank body 3 heats the internal glucosamine raw material liquid, the servo motor 190 on the mixing and scraping mechanism 19 works, which can drive the cylinder 191 and the multiple groups of stirring blades 196 on the outer wall to rotate, and the glucosamine liquid in the vacuum concentration tank body 3 can be mixed and stirred, so that the glucosamine liquid is fully in contact with the heating structure in the vacuum concentration tank body 3, and the heating effect on the glucosamine liquid raw material is good, thereby improving the vacuum concentration effect. Under the vacuum environment, the boiling point of the glucosamine raw material liquid is reduced, and the solvent begins to evaporate. The evaporated solvent is condensed into liquid through the separation component and recovered, while the concentrated glucosamine remains in the vacuum concentration tank body 3. After the solenoid valve on the discharge pipe 16 is subsequently opened, the concentrated glucosamine can be discharged;

[0040] When the vacuum concentration tank 3 needs to be cleaned, first, the feeding hopper 17 stops adding glucosamine raw materials, the solenoid valve on the discharge pipe 16 can be opened, and the water pump 180 on the spray cleaning component 18 works to transport clean water to the water supply pipe 182, and the two groups of branch pipes 183 then transport the clean water to the two groups of high-pressure nozzles 184, and the two groups of high-pressure nozzles 184 then spray the clean water into the vacuum concentration tank 3, and the stepper motor 195 on the mixing and scraping mechanism 19 works, that is, it drives the screw rod 199 to rotate forward or reverse, and the multiple groups of threaded sleeves 1910 threadedly connected to the screw rod 199 pass through the slide groove 1911 After the connecting slider 1912 is limited by sliding, the connecting slider 1912 can move back and forth up and down in the dust 1911, that is, the multiple groups of stirring blades 196 and the arc-shaped scraper plate 198 can move back and forth up and down, and the rotation of the cylinder 191, the water spraying of the high-pressure nozzle 184, and the rotation and up and down reciprocating movement of the arc-shaped scraper plate 198 can quickly scrape off the glucosamine raw material residues remaining on the inner wall of the vacuum concentration tank 3, thereby realizing rapid cleaning of the vacuum concentration device, avoiding the residual raw materials from affecting the next glucosamine concentration effect, and improving the concentration effect of the vacuum concentration device for glucosamine preparation.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum concentration device for preparing glucosamine, comprising a supporting base plate (1), wherein four groups of brackets (2) are provided on the supporting base plate (1), and a vacuum concentration tank (3) is installed on the four groups of brackets (2), characterized in that: The front end surface of the vacuum concentration tank body (3) is provided with a temperature display screen (12), a pressure gauge (13) and a control panel (14); the top of the vacuum concentration tank body (3) is provided with a top cover (4), and the top cover (4) is provided with a feeding hopper (17) connected to the inner cavity of the vacuum concentration tank body (3); the bottom of the vacuum concentration tank body (3) is connected with a discharge pipe (16) which is arranged in communication, and the discharge pipe (16) and the feeding hopper (17) are both provided with solenoid valves; the right side wall of the vacuum concentration tank body (3) is provided with a vacuum pump (15), and the vacuum pump (15) is connected to the inner cavity of the vacuum concentration tank body (3) through a pipeline; the vacuum concentration tank body (3) is also provided with a separation component which is arranged in communication; A spray cleaning component (18) is provided at the bottom of the inner cavity of the vacuum concentration tank (3), and the spray cleaning component (18) includes two groups of high-pressure nozzles (184); The inner cavity of the vacuum concentration tank body (3) is also provided with a mixing and scraping mechanism (19), the mixing and scraping mechanism (19) comprising a servo motor (190), the servo motor (190) being mounted on the top of the top cover (4), and the output end of the servo motor (190) being connected to a driving shaft (192), the bottom of the driving shaft (192) being provided with a cylinder (191), the outer wall of the cylinder (191) being connected to a plurality of groups of stirring blades (196), the outer wall of each group of stirring blades (196) being provided with a connecting rod (197), and the other end of each group of connecting rods (197) being provided with an arc-shaped scraping plate (198), the arc-shaped outer wall of each group of arc-shaped scraping plates (198) being in contact with the inner wall of the vacuum concentration tank body (3).

2. The vacuum concentrator for preparing glucosamine according to claim 1, characterized in that: The spray cleaning component (18) further comprises a water pump (180), the water pump (180) being connected to the left outer wall of the vacuum concentration tank (3), the water inlet of the water pump (180) being connected to a clean water pipe (181), the water outlet of the water pump (180) being installed with a water supply pipe (182), the water supply pipe (182) being provided with two groups of flow diversion pipes (183) arranged in communication with each other, and the two groups of flow diversion pipes (183) being respectively connected to two groups of high-pressure nozzles (184).

3. The vacuum concentrator for preparing glucosamine according to claim 1, characterized in that: The bottom of the driving shaft (192) passes through the top cover (4), and the bottom of the driving shaft (192) is connected to a mounting plate (193). The lower surface of the mounting plate (193) is provided with two groups of connecting frames (194), and the bottoms of the two groups of connecting frames (194) are connected to the side wall of the cylinder (191). The mixing and scraping mechanism (19) further includes a stepping motor (195), and the stepping motor (195) is located at the top of the cylinder (191).

4. The vacuum concentrator for preparing glucosamine according to claim 3, characterized in that: The output end of the stepper motor (195) is connected to a lead screw (199), the bottom of the lead screw (199) is rotatably connected to the bottom wall of the inner cavity of the cylinder (191) via a bearing, and a plurality of sets of threaded sleeves (1910) are threadedly connected to the lead screw (199).

5. The vacuum concentrator for preparing glucosamine according to claim 4, characterized in that: Both side walls of the cylinder (191) are provided with through slide grooves (1911), and multiple groups of connecting slide blocks (1912) are vertically slidably connected in the through slide grooves (1911) on both sides, and both ends of the connecting slide blocks (1912) are respectively connected to the threaded sleeve (1910) and the stirring blade (196).

6. The vacuum concentrator for preparing glucosamine according to claim 1, characterized in that: The separation assembly comprises a liquid receiving box (10), the liquid receiving box (10) being connected to the supporting base plate (1) via a supporting frame, a liquid discharge pipe (11) being connected and arranged on the side wall at the bottom end of the liquid receiving box (10), and a cooler (9) being connected and arranged on the top of the liquid receiving box (10).

7. The vacuum concentrator for preparing glucosamine according to claim 6, characterized in that: The vacuum concentration tank body (3) is also provided with a first condenser (5) which is connected to the vacuum concentration tank body (3). The other end of the first condenser (5) is provided with a separator (6). The separator (6) is connected with a second condenser (8), and the bottom end of the second condenser (8) is connected with a cooler (9). The separator (6) is also provided with a reflux pipe (7), and the other end of the reflux pipe (7) is connected to the inner cavity of the vacuum concentration tank body (3).

8. The vacuum concentrator for preparing glucosamine according to claim 3, characterized in that: A sealing gasket is provided at the connection between the top cover (4) and the vacuum concentration tank body (3), and a protective shell is installed on the outside of the stepping motor (195).

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